Lathe-tool.



Patented Aug. 31, 1909.

nvemtort J. D. RAMSEY.

LATHE TOOL.

APPLICATION FILED 8EPT.24,1908.

FLY? f Wnass'es dog w 4 (JOSEPHCDL nansnr, or'noncnns'rnn, MASSACHUSETTS.

. LATHE-TOOL.

Specification of Letters Patent.

Application filed September 24i1908. Serial No. 454,58

To all whom it may concern:

Be it known that I, J OSEPH D. RAMSEY, a citizen of the United States, residing at Dorchester, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Lathe-Tools, of which the following is a specification.

This invention relates to improvements in lathe tools and particularly to that .class of lathe tools in which the tool proper is removably mounted in aholder. l a

In turning very hard steels 'itis desirable that the point of the tool shall beadapted to yield very slightly in the direction of rotation of the work and heretofore it has been proposed to form a tool holderin two relaing connection, one of saidpartssupporting the tool and to provide a spring tending to. move the part which supports the tool awayfrom the other-partfin such a manner that the spring is opposed to the resistance of fered by the chip belng removed from the rotating work, there being provided. means to vary the tension of said spring. Such tools, especially when employed in tool. cutting, have this disadvantagethat when the tension of the spring is varied the upper face of the tool which should lie exactly in a horizontal plane containing the axis of the work is moved out of said plane and the thread which is cut by the tool is consequently inaccurately formed.

One of the objects of my invention is to overcome the difficulty just described-and in the attainment of this object .I'have provided means to limit the movement of the toolrupwardly so that the tension of the Referring to the drawing: Figure 1 is a plan of a lathe tool embodyingvmy invention. Fig. 2 is a sectional elevation taken on line 22 of Fig. 1. Fig. 3 isafrontelevation of the tool, as viewed from the left of Figs. 1 and 2. Fig. 4 is a detail side elevation of the adjusting screw'foradjusting the tension of the spring. isa detail.

end elevation of the hexagonal head for the adjusting screw shown in Fig. 4.

Like numerals refer to like parts throughout the several views of the drawing.

In thedrawing, 10 is a holder having two parts 11 and 12 connected by a yielding connection13 which is preferably U-shaped in form and which is preferably formed integral with said parts. The part 12 constitutes a shank'which is adapted to be fitted into a tool post of a lathe and secured therein, said shank being suitably off-set, as

shown after the fashionof manylathe tools. The part 11 is provided with a hole 14 extending therethrough in the same general di- 7 rection as the shank of the holder and the tively movable parts connected by a yieldf part 12 is provided with a corresponding hole 15, said hQlesTbeing provided for the reception of a tool 16 which rests upon two pins 17 .17 passing through the hole 14 and terminating at opposite ends, respectively,

thereof in'the p art'll. A plate or block 18 located in the hole 15 is provided with two lugs 19, 19 extending upwardly in contact with opposite faces, respectively, of the part 11 said lugs preventing said block from slipping out of said hole while the tool 16 gisin place. l

j Asetscrew screw-threaded engagement'wi'th the part llbears against the upperside of the block 18 and is adapted when rotated in the proper direction to force one or more other faces of the proper arrangement, such tools being too well known to require further description. The opposite end of the tool 16 may also be provided with a cuttingedge, if desired, so that the same may be reversed.

Inpractice, the holes 14; and 15 are formed by drilling holes into the holder from the left hand side thereof and broaching out the materialfbetween the drilled holes. By reason of the provision of the pins 17, 17, it is unnecessary to broach the lower side of the holes 14 and 15 so as to form square corners and there is consequently a considerable saving in the cost of manufacture. The part 12 is provided with a recess 22 in which is located a helical compression spring 23 which may be formed of wire which isrectangular PatentedAug m, 1909.

7 V necessary to screw the ad usting screw into formed in a head 27.- The head 27 is formed separately from the screw 24 so as to make it possible to assemble the device, it being place first from theleft hand end of the tool and then slip the-head 27' into place.-

The spring 23 bears partly against the lugs 25, 25 and partly against the head 27 thereby holding said head inplace on the screw 24. By applying a proper wrench to the head 27 which may be hexagonal inform, the screw may be rotated to vary the tension of the spring-23" so as to opposea greater or lessresista-nce to theactionof the rotating work which is indicated in dotted lines in Fig. 2, the direction of rotation being indicated by the arrow. A rod 28 is secured atone end to the part 12 by means of a pin 29 passing through said part and being located in a corresponding depression formed in said rod, 4 sa-id rod extending through the spring 23 and throughthe ad justingscrew 24 which is made hollow for this purpose. .Theprod 28 hasformed thereon "stop 30 which extends transversely thereof and which bears against the outer face ofthe part l l, said step serving tolimit the movement of said part toward the left with relation to the part 12. Therefore, no

matter how great the tension of the spring 23, the upperface 21 of the tool' 1 6 when" once adjustedso as to liein apl'ane At-A containingthe axis of'the work will not be carried abovesaid plane. 'This} is a very important featureof Ynyinvention inasmuch as in screwcutting if the upper face of the tool.

rises above-a horizontal plane containing the aXisof the work it is fatal and will: consequently be spoiled;

I nworkingoir some grades of steel it is desirable to have a slight'tensi'on opposed to t'he' action ofthe rotating work, while in other cases it is desirableto have a greater tension and -it will be understoodthat the tensionof the spring 23 may: be varied through a wide range so as tosuit all of the varying conditions, yet without impairing the thread the accuracy of the tool}. It willalso be understood that the U-shaped connection 1 3 in itself constitutes a powerfulspring sup- 7, plementing the-spring- 233 Heretoforedn leveling a tool of this charact'en afteiithe' same has been placed in the toemplfoy a surface gage to test the level ofthjeiuppen face ofthe workingportion of the tool, which in this instance-is the face 21'. Such manner of adjustment isnecessarilyquite addition is apt to he in holder is comparatively short. In order that .this adjustment of the tool may be easily, quickly and accurately efi'ected, I provide the shank 12 with a hole 31 extending there-- into from the right hand end thereof and provide also a hole 32'leading thereinto from the upper side and placing into the first men- 1 tioned hole a spirit level 33 preferably interposed between two cork plugs 34 and 35.

In the manufacture of the tool holder, the same is placed in ajig so that the hole 31 may be drilled in such a manner that its axis will lie in a plane parallel to a plane tangent to the pins 17, 17 so that when the tool 16 is in place, the upper face 21 thereof which parallel to the l ower face will also he ina plane parallel to a horizontal plane containing the axis of the hole 31. Therefore, when the shank 12- of the tool is placed in the tool holder the bubble of the spirit level will always accurately indicate the level ofthe surface 21. This is of great practicaladvantage and results ina great saving of time overother methods hereinbefore employed for accomplishing this result and the adjustment is furthermore muchmore accurate than has heretofore been possible.

It will be noted that the tool 1 6 bears againstboth of the lateral faces of each of the holes 14 and 15-. This feature is of great practical advantage" since it prevents part 11 la-terallywith relation to thepart 12.

Havingthus described my invention, what I claim and (165116 by Letters Patent to secure is:

' 1. Thecombinationin a device of-the class described of a holder having two relatively movable parts, one of which is adapted to support a tool and the other of which is adapted to be rigidly secured to a tool post, a stopadapted to limit the movement of one of said parts with relation to theother inone direction, and aspring adapted to hold One-cfsaid parts against said stop.

2. The combination in a device of the-class described of a holder having two relatively movable parts, one of which is adapted to supporta tool and the other of which is' adapted to be rigidly secured to atool post, a stop-adapted t'o-limit themovementof one of said parts with relation to the other in one direction, a spring-adapted tohold one- 1 ofsaid' parts against saidstop, and means to V vary the tension of said spring. tool post of a lathe, it has been customary 32 The combination in-a' device of the class described of a holder havin tworelatively movable parts, one of which is adapted to" support a tool and theother of whiclr is adapted to; be rigidly secured to a tool post,

a stop secured to oneof said parts land adapted to limit the relative movement of said arts in one direction, a spring adapted to hdld one of said parts against said stop, and a screw adapted to be rotated to vary the tension of said spring.

4:. The combination in a machine of the class described of a holder having two relatively movable parts, one of which is adapted to be rigidly secured to a tool post, atool supported on theothe-r of said parts, a yielding connection between said parts, a stop adapted to limit the movement of one of said parts with relation to the otherin one direction, and a spring adapted to hold one of said parts against said stop.

5. The combination in a device of the class described of a holder having two relatively movable parts, one of which is adapted to be rigidly secured to a tool post, a tool supported on the other of said parts, a substantially U-shaped connection between said parts, a stop adapted to limit the movement of one of said parts with relation to the other in.

one direction, and a spring adapted to hold one of said parts against said stop.

6. The combination in a device of the class a yielding connection between said parts, a

stop adapted to limit the movement of one of said parts with relation to theother in one direction, a spring adapted to hold one of said parts against said stop, and means to V vary the tension of said spring.

7 The combination in a device ofthe class described of a holder having two relatively movable parts, one of which is adapted to support a tool, and the other of which is adapted to be rigidly secured to a tool post, a yielding connection between saidparts', a spring interposed between said parts and tending to force one of said parts away from the other, a stop adapted to limit the move-. ment of said parts away from each other, and means to vary the tension of said's'pring.

8. The combination in a device of the class described of a holder having two relatively same is supported, a yielding connectioirbetween said parts, a spring interposed between said parts and tending to force one of said parts away from the other, a stop adapted to limit the movement of said parts 1 away from each other, and

means to vary the tension of said sprlng.

9. The combination in a device ofthe class described of a holder having two relatively movable part-s, a tool supported on one of said parts, a yielding connection between said parts, a helical compression spring tending to force one of said parts away from the other, a rod fast to one of said parts and having thereon a stop adapted to limit the movement of said parts away from each other, and means to vary the tension of said spring.

10. The combination in a device of the class described ofa holder having two relatively movable parts, a yielding connection between said parts, a helical compression spring tending to force one of said parts away from the other, a hollow screw having screw-threaded engagement with one of said parts and adapted to be rotated to vary the tension of said spring, and a rod fast to one of said parts extending through said spring and screw and having thereon a stop adapted to limit themovement of said parts away from each other.

11. The combination in a device of the class described of a holder provided With a hole, two rigidly supported pins extending transversely through said hole, a tool located in said hole resting upon said pins, and means toclamp saidtool against said pins.

12. The combination, in a device of the class described, of a holder having two relatively movable parts, a tool supported on one of said parts, a yielding connection between said parts, a helical compression spring tending to force one of said parts away from the other, and a rod fast to one of said parts and having a stop thereon adapted to limit the movement of said parts away from each other.

13. The combination, in a device of the class described, of a holder having two relatively movable parts, a tool supported on one of ,said parts, a helical compression spring tending to force 'one of said parts away from the other, and a rod fast to one of said parts and having thereon a stop adapted to limit themovement of said parts away from each other.

.14. The combination, in a device of the class described, of aholder having two relatively movable parts, a helical compression springv tending to force one of said parts away from the other, a hollow screw having screw-threaded engagement with one of said parts and adapted to be rotated to vary the tension of said spring, and a rod fast to one and screw and having thereon a stop adapted, to limit the movement of said parts away from each other.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. 3

JOSEPH D. RAMSEY.

. of said parts extending through said spring 

